Clinical and Radiological Evaluation of Patients With DDD Following TLIF With 3-D Printed Titanium Cage

Inclusion Criteria: * Subject has one or more of the following diagnoses: degenerative disc disease (DDD) at one level or two contiguous levels from L2 to S1, and may also include up to Grade I spondylolisthesis at the involved level(s); degenerative scoliosis for which the Tritanium PL cage will be used as an adjunct to fusion * Skeletally mature and ≥ 18 years old at time of enrollment * Completed at least 6 months of non-operative therapy prior to surgery * Willing and able to sign a study specific consent and comply with the requirements of the protocol including follow up visits and imaging. Exclusion Criteria: * 2 levels requiring surgical intervention * Non-degenerative pathology including tumor, trauma, post-laminectomy kyphosis * Psudeoarthrosis at the index level * Previous fusion at the levels to be treated or at adjacent level * Any abnormality present which affects the normal process of bone remodeling including, but not limited to, severe osteoporosis involving the spine, bone absorption, osteopenia, primary or metastatic tumors involving the spine, active infection at the site or certain metabolic disorders affecting osteogenesis. * History of osteoporotic fracture * History of an endocrine or metabolic disorder known to affect bone and mineral metabolism * Inadequate tissue coverage over the operative site or taking medications that may interfere with bony/soft tissue healing including chronic steroid use * Known allergy to titanium or cobalt chrome or may …